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Simultaneous removal of 2,4,6-tribromophenol from water and bromate ion minimization by ozonation.

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Title: Simultaneous removal of 2,4,6-tribromophenol from water and bromate ion minimization by ozonation.
Authors: Gounden, Asogan N.1, Singh, Sooboo2, Jonnalagadda, Sreekantha B.2
Source: Journal of Hazardous Materials. Sep2018, Vol. 357, p415-423. 9p.
Subjects: Bromophenols, Bromates, Carbon, Ozone, Hydrogen peroxide
Abstract: The study investigates the degradation of 2,4,6-tribromophenol (2,4,6-TBP) and the influence of solution pH, alkalinity, H 2 O 2 and O 3 dosage. Debromination efficiency of 2,4,6-TBP was the highest in basic water (pH = 10.61). The extent of TOC removal compared favourably with the amount of substrate converted, suggesting favourable mineralization of oxygenated by-products (OBPs). Ozonation in basic water favoured the formation of toxic   B r O 3 - , while in acidic water (pH = 2.27) B r O 3 - yield was lowest. In acidic water the presence of C O 3 2 - showed negligible effect on conversion, TOC and   B r O 3 - yield compared to ozonation alone. In basic water both 2,4,6-TBP conversion and TOC removal decreased with an increase in C O 3 2 - , hence minimizing B r O 3 - formation. The O 3 / H 2 O 2 process showed an improvement in the debromination efficiency and TOC data revealed that total mineralization of OBP’s was achieved. However, only 10% H 2 O 2 was able to effectively decrease B r O 3 - formation. Increasing the ozone concentration from 20 to 100 ppm enhanced the conversion of 2,4,6-TBP and TOC removal. At low ozone concentrations poor mineralization of OBP’s occurred, while complete mineralization was achieved at higher ozone dose. The reaction pathways for ozone degradation of 2,4,6-TBP in acidic and basic waters is proposed. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The study investigates the degradation of 2,4,6-tribromophenol (2,4,6-TBP) and the influence of solution pH, alkalinity, H 2 O 2 and O 3 dosage. Debromination efficiency of 2,4,6-TBP was the highest in basic water (pH = 10.61). The extent of TOC removal compared favourably with the amount of substrate converted, suggesting favourable mineralization of oxygenated by-products (OBPs). Ozonation in basic water favoured the formation of toxic   B r O 3 - , while in acidic water (pH = 2.27) B r O 3 - yield was lowest. In acidic water the presence of C O 3 2 - showed negligible effect on conversion, TOC and   B r O 3 - yield compared to ozonation alone. In basic water both 2,4,6-TBP conversion and TOC removal decreased with an increase in C O 3 2 - , hence minimizing B r O 3 - formation. The O 3 / H 2 O 2 process showed an improvement in the debromination efficiency and TOC data revealed that total mineralization of OBP’s was achieved. However, only 10% H 2 O 2 was able to effectively decrease B r O 3 - formation. Increasing the ozone concentration from 20 to 100 ppm enhanced the conversion of 2,4,6-TBP and TOC removal. At low ozone concentrations poor mineralization of OBP’s occurred, while complete mineralization was achieved at higher ozone dose. The reaction pathways for ozone degradation of 2,4,6-TBP in acidic and basic waters is proposed. [ABSTRACT FROM AUTHOR]
ISSN:03043894
DOI:10.1016/j.jhazmat.2018.06.006